Collar



FIG. 1 is a front perspective view of a collar showing my new design, the broken line showing of the shirt is for illustrative purposes only and forms no part of the claimed design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof, the right side view being a mirror image of the left side view;

FIG. 5 is a top plan view of the collar; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a collar, as shown and described. 